JPS609704A - Section for wet type paper making of fibrous slurry - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wet paper forming material for forming a paper product of a desired shape from an inorganic fiber slurry or an organic fiber slurry.

Traditionally, this type of mold material has been made as shown in Figure 1.
A small-diameter conical through hole (b) is formed in the mold formed into the desired shape (a).
At the same time, a wire mesh (C) is attached along the papermaking mold surface, and the wire mesh (C) is connected to the through hole (b) with a metal wire (d).
) is used.

However, such molding material is expensive, so it has the problem that it cannot be depreciated unless it is a mass-produced product such as Etsuta Tray.In addition, not only is it time-consuming to install the wire mesh (C), but the molding material is also expensive. - In the case of rough shapes, it is difficult to attach one piece of wire mesh (C) along the mold surface;
There was a drawback that the seams of the wire mesh appeared on the surface of the product, reducing the commercial value.

The present invention was made in view of these problems, and consists of a water-insoluble synthetic resin binder having a particle size of 0.5 to 5. Ow
The object of the present invention is to provide a mold material for wet papermaking having a smooth surface and air permeability, which is formed by bonding m granules made of an inorganic or organic material at a predetermined ratio.

Embodiments of the present invention will be explained with reference to the drawings. In Fig. 2, (1) is a shaped material having a cross-sectional cap with a thickness of 5 to 60 mm, and is made of an inorganic or organic material insoluble in water and has a particle size of 0. It is molded from a material in which granules (2) of .5 to 5.0 cm and a water-insoluble synthetic resin binder (3) are uniformly mixed in a weight ratio of 4:1 to 20:1. It is what it is.

As the granules (2), inorganic granules such as ceramic pieces, glass beads, fly ash 1, water slab particles, etc., and organic synthetic resin granules such as Stitch Shijis, Ethish Shijis, etc. can be used alone. It can be used alone or in combination.

The shape of such granules (2) is determined by mixing the granules (2) with the synthetic resin binder (8) and pressing and molding the mold material (1).
In order to improve the beam quality between the male and female molds for molding the mold material and to make the surface of the resulting mold material (1) smooth, an annular shape close to a spherical shape such as a spherical shape, a circular shape, or a cylindrical shape is used. used. On the other hand, if granules with corners on the surface are used, the voids between the granules will become uneven during the production of the mold material, and when the resulting mold material is used to suck the fiber material from the slurry to make paper, This is not preferable because it causes a difference in the strength of the suction force on the surface of the mold material, causing uneven papermaking.

In addition, in order to provide the mold material (1) with effective air permeability, the particle size of the granules (2) needs to be between 0.5 and 5.0 mm, but the variation in particle size must be within ±0. It is desirable that the length be 3 m.

This is because if granules with a large range of unevenness are used, the size of the voids between the granules will vary, and for example, if small-diameter granules get between large granules, the air permeability of the mold material will be inhibited. As a result, the paper-making ability decreases, and some parts have poor air permeability, which causes variations in the suction force during paper-making, resulting in uneven thickness of the molded product, making it difficult to obtain a good molded product. It's for a reason.

On the other hand, as the synthetic resin binder (8) used as a binder for the granules (2), there are room-temperature curing resins or heat-curing resins such as ebony resin and polyester resin.

When molding the mold material (1) by mixing these granules (2) and the synthetic resin binder (3), the synthetic resin binder (
It is necessary to mix granules (2) in a weight ratio of 4 to 20 times that of 1 in 3).

The reason for this is that if the mixing ratio of the granules to 1 part by weight of the synthetic resin binder is 4 parts by weight or less, the voids between the granules will be filled with the synthetic resin binder, and the voids of the resulting mold material will become smaller. This is because the air permeability is insufficient and the water removal efficiency during papermaking of the fibrous slurry becomes poor.Furthermore, if the mixing ratio of granules is 20 parts or more, the granules due to the synthetic resin binder This is because the bonding force between bodies is weakened, and the strength of the mold material is insufficient, making it easy to break.

The mold material (1) thus formed is immersed in a fibrous slurry, and air is sucked into the vacuum generation chamber formed above or below by a suction pump, thereby forming a mold surface of the mold material (1) having air permeability. Slurry is adsorbed to a desired thickness and used for wet papermaking, but if the thickness of the mold material (1) is thin, it is weak in strength and may break if used repeatedly. As shown in Figure 3, a mold material σ) is used, which is made by integrally layering a reinforcing molding plate (4) made of glass fiber reinforced synthetic resin (hereinafter referred to as FRP resin) on the opposite side of the mold surface. It is something.

The thickness of the FRP molded plate (4) is about 10 m, and the thickness is about 10 m.
■Vent holes (5) with a diameter of about 8.0 mm are drilled between the front and back surfaces at each interval. It is preferable to provide a large number of small-diameter ventilation holes, but since there is a relationship with the strength of the molded plate, they are appropriately set according to the product specifications.

This dried ff4J sweet (1'lfs vinegar power trace and 1
．． After coating the surface of the wooden mold (6) with the desired shape shown in Figure 4 and applying a mold release agent (Jylease) (7), the granules (2) and synthetic resin are applied. If the mixed composition with the binder (3) is applied to a desired thickness and then pressure molded from the surface side with a female die, a molded material without an FRP molded plate can be obtained. It is obtained by placing the PRP molded plate (4) on top and clamping the mold under resin curing conditions to integrate, and then releasing the mold.

In this case, ventilation holes may be punched in advance in the FRP molded plate, or they may be punched after the mold is released as shown in FIG.

Figure 6 shows the wet papermaking method using the mold material of the present invention.
The mold material (7) is attached to the lower end opening of the vacuum generation chamber (8), and the vacuum generation chamber (8) is connected to a suction posy (not shown). The mold material (1') is inserted into the vat (lO) containing the wool slurry (9) and immersed in the slurry, and the vacuum generation chamber (8) is depressurized to open the ventilation hole of the FRP molded plate (4). By adsorbing the slurry (9) to an appropriate thickness on the mold surface of the mold material (1) through the voids between the granules constituting the mold material (1) and the mold material (5), a t-rued paper product (1υ) is obtained. A molded article is obtained by putting this t-old paper product (11) into a hot air circulation type dry P- and drying it.

The surface of the molded product obtained in this way has minute irregularities due to the granules constituting the mold material, but is formed as a clean surface overall. Note that as a slurry, Inorganic fiber slurry and pulp such as 0 Tsuku wool, ceramic fiber, carbon fiber, etc.
A fibrous slurry such as polyethylene fiber or a mixture of these fibrous materials is used, and its concentration is 0.5
~3% is suitable.

As described above, in the present invention, the weight ratio of granules made of a water-insoluble inorganic or organic material having a particle size of 0.5 to 1 Ow and a water-insoluble synthetic resin binder is 4 = 1 to 20: Since this relates to a mold material for wet papermaking of fibrous slurry that is formed by bonding at a ratio of 1:1 to a mold material having air permeability, the granular material is less By adjusting the particle size, it is possible to obtain a paper molded product with a smooth surface, and there is no risk of problems such as rust.
It is possible to form a stable and good molded product.Furthermore, since the mold material is made by bonding small-diameter granules with a synthetic resin binder, the manufacturing cost of the mold material can be reduced, and it can be made in small quantities. The production of paper-made molded bodies is sufficiently profitable, and mold materials corresponding to molded bodies of complex shapes can be easily produced.

In addition, the present invention provides a structure in which a molding plate with a large number of through holes is integrally layered on one side of the above-mentioned shape material, thereby supplementing the strength of the shape material made of the granules, thereby increasing the ease of handling and durability with repeated use. In addition, the thickness of the mold material made of granules can be made thinner to further increase air permeability, so that the air intake from the through-holes of the mold plate is evenly distributed over the entire mold material, increasing papermaking efficiency. It is something that can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional mold material, FIGS. 2 to 6 show an embodiment of the present invention, FIGS. 2 and 3 are sectional views of the mold material, and FIGS. 4 and 5 are sectional views of the mold material. A simplified cross-sectional view showing an example of manufacturing a mold material; FIG. 6 is a simplified cross-sectional view when papermaking is performed. (1) (1)... Shape material, (2)... Granular material, (3
)...Synthetic resin binder, (4)...Molded plate. Patent applicant: Daiken Kogyo Co., Ltd.

Claims (1)

[Claims] ■ Made of water-insoluble inorganic or organic material with a particle size of 0.
5-5. (A fibrous slurry made by combining 1 m of granules, 1 part of water, and an insoluble synthetic resin binder at a weight ratio of 4:1 to 20:1 and molding it into an air-permeable mold material. A molding material for wet papermaking.■ A molding material for wet papermaking of a fibrous slurry according to claim 1, wherein the granules are in the shape of any one of spherical, circular, cylindrical, and ring shapes. The mold material for wet papermaking of a fibrous slurry according to claim 1 or 2, which has a particle size of 0.5 to 5.0 mm and a variation of ±0.3 mm. ■ Made of inorganic or organic material that is insoluble in water and has a particle size of 0.
A large number of penetrations are formed on one side of an air-permeable mold material made by bonding and molding granules of 5 to 5.0 particles and a water-insoluble synthetic resin binder at a weight ratio of 4:1 to 20:1. A molding material for wet forming of fibrous slurry made by integrally layering molded plates with holes. (2) A molding material for wet papermaking of fibrous slurry according to claim 4, wherein the molding plate is made of a glass fiber-reinforced synthetic resin.